GoKawiilDeveloper releases open-source Arduino library for AMT630A OSD chip in $35 backup cameras
A developer reverse-engineered the AMT630A chip used in cheap composite-video LCD monitor boards and published an Arduino/ESP32 library, now at version 0.7.0, that controls its on-screen display hardware. The library exposes the chip's five OSD windows for text, custom glyphs, bitmaps, palette animation, scaling and blending, alongside a Python image converter and optional automation to reach a hidden factory menu on one tested monitor's firmware.
GoKawiil's interpretation of the reporting above, not reported fact.
Backup-camera monitor boards are mass-produced low-cost hardware that typically ships as a closed black box, so documenting and exposing the AMT630A's OSD engine could let hobbyists repurpose these cheap displays for custom HUDs or instrument overlays. The project's own notes caution that AMT630A boards vary in firmware, panel timing and keypad wiring, suggesting the library's compatibility may be inconsistent across different vendors' hardware.
- The AMT630A OSD library is an open-source Arduino/ESP32 tool for controlling on-screen display hardware in cheap LCD monitor boards.
- It supports five OSD windows with text, bitmaps, palette animation, scaling, blending and window movement, plus a Python image converter.
- The developer warns that AMT630A-based products differ in firmware and hardware, so results may vary across different monitor boards.
ESP32-WROOM-32 Development Board — This project is built around controlling I2C-based OSD hardware with a microcontroller, and an ESP32 dev board is the perfect platform to run the AMT630A OSD library. It gives you plenty of GPIO and I2C support for wiring into composite-video monitor boards like the ones reverse-engineered here. Great for hobbyists who want to replicate or extend this backup-camera HUD hacking project.
See ESP32-WROOM-32 Development Board on Amazon → Affiliate link — we may earn a commission on purchases, at no extra cost to you. Product picked by AI based on this article; it is not a tested recommendation.Source: github.com, 2026-09-28
Published there as: “Reverse-engineering a $35 backup camera display (AMT630A)”
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